Digital Signal Level Meters
IT-910C Series
User Manual
SHEET 2 OF 11
Revision History
Revision
Description
Date
Author
01
Created
2014-9-18
INOTECH
SHEET 3 OF 11
Content
1. Note ................................................................................................................................................................. 4
2. Product Description ................................................................................................................................... 5
2.1 Introduction ................................................................................................................................ ........................ 5
2.2 Front panel and description ........................................................................................................................... 5
3. Operation Instructions ............................................................................................................................... 6
3.1 Power on/off the meter .................................................................................................................................... 6
3.2 Single channel/frequency measurement .................................................................................................... 6
3.3 Tilt measurement .............................................................................................................................................. 7
3.4 CNR measurement............................................................................................................................................ 8
3.5 Voltage measurement ...................................................................................................................................... 8
3.6 Meter configuration .......................................................................................................................................... 8
4. Technical Specifications ......................................................................................................................... 11
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1. Note
First Operation
Please read this manual carefully before using this product.
Specification Changes
Technical specifications and operation methods included in this manual are subject to changes without
notice. In case of any inquires after a period of usage, please consult the manufacturer.
Warranty
Our policy is one year warranty from the date of shipment and lifetime maintenance. In warranty period, the
support service is no cost excluding artificial damage. Chargeable batteries, misuse, unauthorized repair or
modify the failure occurred, and because of natural disasters or abnormal voltage caused by damage to the
machine, not under warranty.
Batteries and Charger
The meter is equipped with a high performance rechargeable Li-On battery. The voltage of battery can be
monitored automatically, the meter shall alarm when power is low. A battery indicator is shown on up right
corner of LCD.
The meter will power off automatically if there is no operation for setting time or low battery.
Please use only the charger provided with the meter, using any other battery charger may overheat or
damage the meter, or cause fire, injury or harm to the environment and will void the warranty. The indicator
on the power adaptor will turn red when the instrument is charging. Make sure the meter is powered of for
battery charging. It needs around 6 hours for full charged.
Attention
Keep the surface of instrument clean. Make sure to operate under specified environment.
Do not use organic solvent or acid to clean the surface of instrument.
Avoid vibration or shaking. Use force on the LCD window will damage the screen.
Charge equipment every half year when not used for a long time.
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2. Product Description
2.1 Introduction
IT-910C is specially designed and manufactured for analogue and digital CATV system installation and testing.
This portable instrument is easy to carry and has many functions. It can test CATV signal level at channel and
frequency mode. Analog signal measurement functions include CATV TILT, C/N, trunk cable voltage, and
digital signal analyses include MER, BER ,average channel power and constellation diagram. IT-910C uses
highlight LCD screen and backlight can be set on or off per needed.
2.2 Front panel and description
1. RF input connector: F-female connector
2. LCD screen
3. Function key, F1 to F4, act as different functions in different display interface
4. Numerical key: 0 to 9, decimal point and plus/minus symbols
5. MENU key: direct key to return to main menu
6. C/S key: turn off or turn on channel key
7. DC input port
8. Power slide button
9. Set key: direct key for meter setting
10. B.L key: direct key for scan function
11. Direction key: 4 keys for up, down, left and right
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3. Operation Instructions
3.1 Power on/off the meter
Slide power button to left location to turn on the meter. Meter will enter main menu after boot screen, as Fig. 31 shows.
Slide power button to right location to turn off the meter.
Fig. 3-1
Fig. 3-2
3.2 Single channel/frequency measurement
3.2.1 Analog channel measurement
For single channel/frequency measurement, use directional/enter key to select ‘CH MEASUREMENT’, or press
numerical ‘1’ key to enter directly in main menu.
Analog channel measurement results show as Fig. 3-2. Analog video and audio carrier level are displayed in
numerical. V/A difference is also shown in this screen.
Press up/down direction key or press F1 key to revise the channel that need test. Press F4 key to return to
main menu.
Note1: Channel number input should be within channel plan list, otherwise it’s invalid. Channel plan
list is provided by customer and has been written into the equipment’s memory before shipping.
Generally, current active channel plan is the first one in the memory. To change channel plan, refer to
chapter 3.6.2.
Note2: Press F2 key can change current analog channel to digital channel. Digital center frequency is
video frequency plus 2.75MHz.
Note3: Press SET key can modify current channel parameters. After modification, press SET key again
to return test screen.
3.2.2 Single frequency measurement
Press F2 key to enter single frequency level measurement mode, as shown in Fig 3-3.If there is FM radio,
press F3 key again to open speaker.
Press F4 return to analogue channel measurement interface.
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Fig. 3-3
Fig. 3-4
Fig. 3-5
3.2.3 Digital channel measurement
Digital channel measurement results show as Fig. 3-4 and 3-5. Average channel power, MER, BER
constellation diagram are shown.
Press up/down direction key or press F1 key to revise the channel that need test.
Press Mute to return to main menu.
Note1: Channel number input should be within channel plan list, otherwise it’s invalid. Channel plan
list is provided by customer and has been written into the equipment’s memory before shipping.
Generally, current active channel plan is the first one in the memory. To change channel plan, refer to
chapter 3.6.2.
Note2: Press F2 key can change current digital channel to analog channel. Analog video frequency is
digital center frequency minus 2.75MHz.
Note3: Press SET key can modify current channel parameters. After modification, press SET key again
to return test screen.
3.3 Tilt measurement
For tilt measurement, use directional/enter key to select ‘TILT’, or press numerical ‘2’ key to enter directly in
main menu. As Fig. 3-6 shows.
Press SET key to enter channel set screen (as fig 3-7 shown). Use numerical/enter key to select test channel.
Up to 10 channels can be set.
Press F4 key to return to main menu.
Tilt measurement screen will show maximum, minimum level and tilt value on right of screen.
There is a triangle mark on screen, which is for channel power mark. Press direction left/right key to select
channel that triangle marks.
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Fig. 3-6
Fig. 3-7
3.4 CNR measurement
Use directional/enter key to select ‘CNR’, or press numerical ‘3’ key to enter directly in main menu, as Fig. 3-8
shows. Use numerical and enter keys or up/right keys to revise measurement channel.
Note: This function is only available when input RF level is higher than 50dBuV.
Fig. 3-8
Fig. 3-9
3.5 Voltage measurement
Use directional/enter key to select ‘VOLTAGE’, or press numerical ‘4’ key to enter directly in main menu, as Fig.
3-9 shows. Press F2 switch to battery voltage display and press F3 switch to internal temperature display of
equipment. Press F4 to return to main menu.
3.6 Meter configuration
Use directional/enter key to select ‘CONFIGURATION’, or press numerical ‘5’ key to enter directly in main
menu, as Fig. 3-10 shows. Press F4 to return to main menu.
There are three options available: Select channel plan, Edit channel and Options.
3.6.1 Select plan
Use up/down direction key and enter key to select Channel plan, totally 3 maximum plans are available before
shipment. As Fig. 3-11 shows.
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Fig. 3-10
Fig. 3-11
3.6.2 Edit Channel
Use up/down direction key and enter key to enter Edit Channel screen. Also use up/down direction key and
enter key to select channel that need edit, as Fig. 3-12 and Fig. 3-13 show.
Analog channel edit screen as Fig. 3-12.
Channel number: Press direction keys up/down to select ‘CH’, then press enter key to confirm. Press number
keys to input channel number and press enter key to confirm. If the input channel number exists, channel
number will remain unmodified.
Channel type: Press direction keys up/down to select ‘TYPE’, then press enter key to switch between analog
and digital.
Video frequency: Press direction keys up/down to select ‘Video’, then press enter key to confirm. Press
number keys to input video frequency, and press enter key to confirm.
Sound frequency: Press direction keys up/down to select ‘Audio’, then press enter key to switch audio
frequency.
Modify: Press direction keys up/down to select ‘Modify’, then press enter key to confirm. Press number keys to
input correct level value (range from -9.9dB to 9.9dB). This function is used to fine tune measurement value.
Fig. 3-12
Fig. 3-13
Fig. 3-14
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Digital channel edit screen as Fig. 3-13 and 3-14.
Channel number: Press direction keys up/down to select ‘CH’, then press enter key to confirm. Press number
keys to input channel number and press enter key to confirm. If the input channel number exists, channel
number will remain unmodified.
Channel type: Press direction keys up/down to select ‘TYPE’, then press enter key to switch between analog
and digital.
Frequency: Press direction keys up/down to select ‘CF’, then press enter key to confirm. Press number keys to
input digital frequency, and press enter key to confirm.
Bandwidth: bandwidth is fixed to 8MHz for DVB-C meter.
Symbol rate: Press direction keys up/down to select ‘SR’, then press enter key to confirm. Press number keys
to input symbol rate, and press enter key to confirm.
QAM mode: Press direction keys up/down to select ‘Mode’, then press enter key to switch between 64QAM,
128QAM and 256QAM.
Modify: Press direction keys up/down to select ‘Modify’, then press enter key to confirm. Press number keys to
input correct level value (range from -9.9dB to 9.9dB). This function is used to fine tune measurement value.
3.6.3 Options
Use up/down direction key and enter key to enter Option screen. As Fig. 3-15 shows. Options are available as
below.
Unit: Press direction keys up/down to select “Unit”, then press enter key continuously to switch between dBuV
and dBmV.
Auto shutdown time: Press direction keys up/down to select “Shutdown”, then press enter key continuously to
switch between 15 minutes and always on.
Fig. 3-15
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4. Technical Specifications
Analog Channels Measurement
Frequency range
48~870MHz
Frequency resolution ratio
50KHz
Bandwidth
280KHz
RF Level Measurement
RF input range
20~120dBuV
Accuracy
+/-1.5dB(25+/-5 degree C)
Resolution
0.1dB
Detection
Peak
C/N Measurement
RF input range
> 50dBuV
Accuracy
+/-2dB
Resolution
0.1dB
Tilt Measurement
Maximum channels supported
10
Resolution
0.1dB
Voltage Measurement
Input range
0~100VAC
Accuracy
+/-2V
Resolution
0.1V
Digital Channels Measurement
Frequency range
48~870MHz
Standard
DVB-C/ITU-T J.83 A/C
Demodulation
16/32/64/128/256QAM
Digital power range
35~120dBuV
Accuracy
+/-2dB(25+/-5 degree C)
Symbol rate
4 ~ 7 Ms/s
MER
19~40dB
BER
10E-3 ~ 10E-9
Power
Battery
chargeable Li-On
Adaptor
100~240VAC
Battery operation time
4 hours full charged
Charge time
6 hours (power off)
General
Dimensions
190x105x50mm
Weight
1.0Kg, battery included
Audio output
Built in speaker
Operation temperature
0 ~ +40 degree C
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